[2.6] ec2_group: fix regression for targets that are a list containing strings and lists

[s-hertel]

SUMMARY

Backport #45594

ec2_group: fix regression for targets that are a list containing strings and lists (#45594)

• Fix targets that may be a list containing strings and lists which worked prior to 2.6.

• Add ec2_group integration tests for lists of nested targets

• changelog

Cherry-picked the fix, the tests, and the changelog. I did not cherry-pick the commit fixing this for diff mode as it can only be backported to 2.7.

(cherry picked from commit 450fb9f)
(cherry picked from commit 14e3399)
(cherry picked from commit fb17db0)

ISSUE TYPE

• Bugfix Pull Request

COMPONENT NAME

ec2_group

ANSIBLE VERSION

2.6

[ansibot]

cc @adq
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[ansibot]

Hi @s-hertel,

Thank you for the pullrequest, just so you are aware we have a dedicated Working Group for aws.
You can find other people interested in this in #ansible-aws on Freenode IRC
For more information about communities, meetings and agendas see https://github.com/ansible/community

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